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          用python爬取并统计百度贴吧回帖数据
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              <time title="创建时间：2020-05-26 17:14:04 / 修改时间：17:23:59" itemprop="dateCreated datePublished" datetime="2020-05-26T17:14:04+08:00">2020-05-26</time>
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        <h1 id="用python爬取并统计百度贴吧回帖数据"><a href="#用python爬取并统计百度贴吧回帖数据" class="headerlink" title="用python爬取并统计百度贴吧回帖数据"></a>用python爬取并统计百度贴吧回帖数据</h1><p>按照回帖数量把回帖者排序</p>
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<p>话不多说，先上代码。</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> requests</span><br><span class="line"><span class="keyword">import</span> re</span><br><span class="line">url = <span class="string">'https://tieba.baidu.com/p/xxxxxxx'</span></span><br><span class="line">r = requests.get(url)</span><br><span class="line">reply_num = re.findall(<span class="string">'&lt;li class="l_reply_num.*?&lt;span.*?&gt;(.*?)&lt;/span'</span>,r.text)  <span class="comment">#使用正则表达式搜索需要的字符串</span></span><br><span class="line">totalpages = re.findall(<span class="string">'共&lt;span class="red"&gt;(.*?)&lt;/span&gt;页'</span>,r.text)</span><br><span class="line">print(<span class="string">'总回复数:'</span>, reply_num[<span class="number">0</span>])</span><br><span class="line">print(<span class="string">'总页数：'</span>, totalpages[<span class="number">0</span>])</span><br><span class="line">num = int(totalpages[<span class="number">0</span>])</span><br><span class="line">user = []</span><br><span class="line"><span class="keyword">for</span> i <span class="keyword">in</span> range(<span class="number">1</span>,num+<span class="number">1</span>):</span><br><span class="line">    URL = url+<span class="string">"?pn="</span>+str(i) <span class="comment">#组合帖子的每页地址</span></span><br><span class="line">    r = requests.get(URL)</span><br><span class="line">    username = re.findall(<span class="string">'fr=pb" target="_blank"&gt;(.*?)&lt;/a&gt;'</span>,r.text)   <span class="comment">#查找回帖用户的昵称，有的昵称里有图片，需要清洗 </span></span><br><span class="line">    <span class="keyword">for</span> j <span class="keyword">in</span> range(<span class="number">0</span>,len(username)):</span><br><span class="line">        dr = re.compile(<span class="string">r'&lt;[^&gt;]+&gt;'</span>,re.S)  <span class="comment">#去掉用户名里边的用来展示图片的&lt;img&gt;标签</span></span><br><span class="line">        name = dr.sub(<span class="string">''</span>,username[j])</span><br><span class="line">        user.append(name)</span><br><span class="line"><span class="comment">#统计各用户的回帖数量</span></span><br><span class="line">dict = &#123;&#125;</span><br><span class="line"><span class="keyword">for</span> key <span class="keyword">in</span> user:</span><br><span class="line">    dict[key] = dict.get(key, <span class="number">0</span>) + <span class="number">1</span></span><br><span class="line"><span class="comment">#print(dict) 未排序的结果</span></span><br><span class="line"><span class="comment">#按回复多少排序</span></span><br><span class="line">print(sorted(dict.items(), key = <span class="keyword">lambda</span> kv:(kv[<span class="number">1</span>], kv[<span class="number">0</span>]), reverse = <span class="literal">True</span>))</span><br></pre></td></tr></table></figure>

<h4 id="项目起源"><a href="#项目起源" class="headerlink" title="项目起源"></a>项目起源</h4><p>最近，需要统计一下贴吧里某个帖子的回复数量以及把回复者按照回复次数排序。于是想到了python的爬虫代码。</p>
<h4 id="大概的思路"><a href="#大概的思路" class="headerlink" title="大概的思路"></a>大概的思路</h4><p>1.使用requests库和re库，来爬取网页信息，并且筛选需要的信息，生成列表<br>2.把列表转换成字典，用户名为key，回帖次数为value，<br>3.在字典中排序，按照次数大小排序。降序排列需要用到reverse参数 False升序，True为降序，注意首字母大写。<br>4.正则表达式最为关键，需要仔细品，多学习，多测试。</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">dr = re.compile(<span class="string">r'&lt;[^&gt;]+&gt;'</span>,re.S)  <span class="comment">#匹配用户名里边的用来展示图片的&lt;img&gt;标签</span></span><br><span class="line">       name = dr.sub(<span class="string">''</span>,username[j])<span class="comment">#去掉&lt;img&gt;标签，只剩下昵称里的字符。</span></span><br></pre></td></tr></table></figure>

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